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For most of the labs you can use GNS3. This is an emulator that runs the Cisco IOS software but you can only emulate routers…no switches. You can download GNS3 for free from but you’ll have to supply the IOS image yourself. Cisco owns the copyright on IOS so it can’t be shared freely. I suggest using the 3640 or 3725 router in GNS3. The closest you can get to emulate a switch in GNS3 is inserting this NM16-ESW Etherswitch module in your virtual router. It adds 16 switch ports to your virtual router and supports basic switching features. Unfortunately this module is very limited and I don’t recommend using it for CCNA. GNS3 isn’t very difficult to work with but there is one thing you need to be aware of. Most people complain that whenever they start an emulated router that they see their CPU jump to 100%. You can fix this by setting a correct IDLEPC value. If you are configuring GNS3 you need to check this video where I explain you how to do it:

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